Electricity and Magnetism CDS Questions

CDS Physics

Electricity and Magnetism MCQ Questions


13.
The SI unit of electrical resistance is the:
A.
Watt
B.
Ohm
C.
Ampere
D.
Volt
😑 View Answer Rough Work Error
ANSWER :
B. Ohm
14.
The electrical resistance of a uniform conductor is directly proportional to its length and inversely proportional to its cross-sectional area. This relationship is expressed by the formula:
A.
R = L/(ρA)
B.
R = ρA/L
C.
R = A/(ρL)
D.
R = ρL/A
😑 View Answer Rough Work Error
ANSWER :
D. R = ρL/A
15.
For most metallic conductors, how does electrical resistance generally change as temperature increases?
A.
Resistance generally increases with increasing temperature
B.
Resistance becomes negative at sufficiently high temperatures
C.
Resistance remains exactly constant regardless of temperature changes
D.
Resistance generally decreases with increasing temperature
😑 View Answer Rough Work Error
ANSWER :
A. Resistance generally increases with increasing temperature
16.
When two or more resistors are connected in series in a circuit, the total (equivalent) resistance of the combination is:
A.
Calculated using the reciprocal sum formula
B.
Always equal to zero, regardless of individual values
C.
The simple sum of the individual resistances
D.
Always less than the smallest individual resistance
😑 View Answer Rough Work Error
ANSWER :
C. The simple sum of the individual resistances
17.
When two or more resistors are connected in parallel in a circuit, the reciprocal of the total (equivalent) resistance is given by:
A.
The sum of the reciprocals of the individual resistances (1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...)
B.
The product of the individual resistances divided by their sum, applicable only for exactly two resistors
C.
The square root of the sum of the squares of the individual resistances
D.
The simple sum of the individual resistances
😑 View Answer Rough Work Error
ANSWER :
A. The sum of the reciprocals of the individual resistances (1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...)
18.
Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series, and a potential difference of 10 V is applied across the entire combination. The current flowing through the circuit will be:
A.
0.1 A
B.
10 A
C.
1 A
D.
100 A
😑 View Answer Rough Work Error
ANSWER :
C. 1 A